Adhesives and sealants
Powder, pellet, filler, additive
and premix behavior across adhesive and sealant production
Mineral fillers, silica, polymer powders, resins, hardeners, microspheres, functional fillers and desiccants are not one category
Particle size, morphology, moisture, surface area, surface treatment, bulk density, cohesion,
wetting behavior, reactivity, and thermal history decide whether a powder discharges, doses
accurately, wets out, disperses to the viscosity you designed, holds its sag resistance, cures
consistently and gives the bond strength the formulation promised. This page connects what
you are seeing in the plant to the mechanism behind it and the measurement that settles it.
Find your route
Start with the material, then the behavior
Adhesive and sealant raw materials do not behave as one category. Pick the filler, silica, polymer powder, resin, hardener, microsphere, conductive filler or desiccant class, then the behavior you are seeing in the process. The result names the mechanisms worth separating, the measurement to start with, and where in the process it usually shows up. It is a triage route, not a diagnosis.
- 1Material
- 2Behavior
- 3Route
Step 1 Â What are you handling?
Step 2 Â What are you seeing?
Step 3 Â Your route
Material routes
Fillers, silica, polymer powders, resins, hardeners and functional additives
Adhesive and sealant production handles fine mineral powders, high surface area silica, redispersible polymers, tackifier resins, reactive hardeners, lightweight microspheres, conductive fillers and moisture scavengers with very different particle sizes, densities, surface chemistries, moisture sensitivities and thermal behaviors. Each class has its own behavior profile, so the most useful route starts with the material before moving to the visible process problem.
Mineral fillers and extenders
Calcium carbonate, talc, clay, and mineral extenders control cost, stiffness, shrinkage, viscosity, and gap filling. Particle size, moisture, loading, and dispersion affect consistency.
Silica and thixotropic powders
Fumed and precipitated silica create viscosity, thixotropy, and sag resistance. Surface area, moisture, agglomeration, and wetting influence mixing energy and rheology.
Polymer and redispersible powders
Redispersible and polymer powders support film formation, flexibility, adhesion, and water resistance. Particle size, protective colloid, moisture, and dispersion affect performance.
Solid resins and tackifier powders
Solid resins and tackifier powders provide tack, green strength, cohesion, and compatibility. Softening point, particle size, oxidation, and distribution affect processing and bonding.
Curing agents and hardener powders
Powdered hardeners and curing agents drive crosslinking and final properties. Moisture, particle size, stoichiometry, dispersion, and premature reaction affect cure consistency.
Glass and ceramic microspheres
Microspheres reduce density, modify rheology, improve insulation, and control shrinkage. Size, strength, surface treatment, breakage, and segregation affect processing and final properties.
Conductive and thermal fillers
Graphite, metal, ceramic, and thermal fillers manage heat, electricity, shielding, or grounding. Shape, surface area, loading, and dispersion directly affect network formation.
Desiccants and moisture scavengers
Desiccants and scavengers protect moisture-sensitive products. Capacity, particle size, activation, compatibility, and storage exposure determine cure stability and shelf life.
Quick comparison
Material route, common risk, first measurement
The same symptom points to different mechanisms depending on the material class, particle size, surface treatment, moisture condition, loading level, formulation and process step. This is the fast bridge between adhesive and sealant material behavior and the most useful first measurement route. The rows follow the same order as the cards above.
Adhesive and sealant material routes, the handling or processing risk each one carries most often, and the measurement worth running first.
| Material route | Common handling or processing risk | Useful first measurement |
|---|---|---|
| Mineral fillers and extenders | Dusting, caking, segregation, inconsistent loading, poor dispersion, and viscosity variation | Particle size, moisture, bulk density, flowability, oil absorption, and surface treatment |
| Silica and thixotropic powders | Agglomeration, poor wetting, dusting, incomplete dispersion, excessive viscosity, and unstable rheology | Surface area, moisture, particle structure, wettability, dispersion quality, and rheology |
| Polymer and redispersible powders | Blocking, moisture uptake, electrostatics, segregation, poor redispersion, and inconsistent film formation | Particle size, moisture, bulk density, redispersibility, glass-transition behavior, and flowability |
| Solid resins and tackifier powders | Blocking, softening, oxidation, feeding variation, incomplete melting, and poor compatibility | Particle size, softening point, thermal history, flowability, melting behavior, and compatibility |
| Curing agents and hardener powders | Moisture sensitivity, segregation, inaccurate dosing, premature reaction, contamination, and cure variation | Particle size, moisture, potency, purity, reactivity, and blend uniformity |
| Glass and ceramic microspheres | Breakage, dusting, segregation, air entrainment, inconsistent density, and loss of insulation performance | Particle size, bulk density, crush strength, wall thickness, moisture, and breakage rate |
| Conductive and thermal fillers | Agglomeration, poor dispersion, excessive viscosity, orientation effects, inconsistent loading, and reduced conductivity | Particle size, morphology, surface area, dispersion quality, conductivity, and thermal performance |
| Desiccants and moisture scavengers | Premature saturation, dusting, segregation, incompatible reaction, poor distribution, and reduced shelf life | Moisture capacity, activation state, particle size, reactivity, storage exposure, and dose uniformity |
One risk per row is the one most often reported, not the only one that occurs. Use the selector above to work a specific combination through to a route.
Recurring problems
Start from the behavior you can see
These eight come from your own route card and comparison table: flow, caking and blocking, dust, dosing and filling variation, segregation, microsphere breakage, moisture sensitivity and poor wetting. Each is one idea rather than three, so the card and the mechanism list line up. Each card runs back to the mechanisms worth separating and forward to the measurement that confirms which one is governing.
Measurement routes
The test that answers your question
Adhesive and sealant material behavior rarely resolves to one number. Particle size, morphology, moisture, cohesion, bulk density, caking tendency, dustiness, blend uniformity, surface area, surface treatment, wettability, rheology and cure response can all contribute to the same visible process symptom. Pick the method by the question, not by the symptom.
Compare every method All test methods on the site, grouped by the question they answer.
Process routes
Where the behavior actually shows up
The same adhesive or sealant material behaves differently depending on where it sits in the process. Receipt, screening, storage, dosing, liquid addition, dispersion, vacuum mixing, thermal processing, filling, application and rework each expose a different property, a different contamination pathway and a different failure mode.
Go deeper
Guides and articles for adhesive and sealant materials
Longer reads that work through the mechanisms behind these routes, from the visible handling problem to material properties, measurement choice and interpretation.
FAQ
Adhesive and sealant material questions
Need the measurement, not just the guidance? PowderTechnology.info works closely with Delft Solids Solutions,
a contract research organization specializing in the physical behavior of powders and granules. DSS provides
contract testing and characterization, with its laboratory working in accordance with ISO 17025.
Contact Delft Solids Solutions.
